From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dirk Brandewie <dirk.brandewie@gmail.com>
Subject: Re: powersave governor runs programs faster and uses more power than
 performance governor
Date: Fri, 25 Oct 2013 07:40:12 -0700
Message-ID: <526A82CC.1040709@gmail.com>
References: <CAMeUXYuuM4LS2qAhhvQi8VG1bK4eiZjjTikchgHzeqi2EX6=bw@mail.gmail.com>	<CAOh2x==D_niGhi-fSSW18WQZjEQU+FngvVCB_K+y+3BRfaz96A@mail.gmail.com> <CAMeUXYuQobSo7Au07V2KBE6=mAqXW1Hj--G92FP0X1H97Kv8OA@mail.gmail.com>
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Return-path: <cpufreq-owner@vger.kernel.org>
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20120113;
        h=message-id:date:from:user-agent:mime-version:to:cc:subject
         :references:in-reply-to:content-type:content-transfer-encoding;
        bh=/bryH0ouJAfLBElL5bJS0owKdYOA8ALfyr4jgXG/x58=;
        b=y8TcOx1vtX0G7/fGdzbjZ4GCxnwqs0dRuxVzxmjdN0ILhnrpQmn8M2O7PtFk9nFFQC
         V5edqsnwiIoUXcnaJ5nL9pj3qic3KwYz/J8tn1wQia7xEPBxBswjuCk+hFoJlCMS67yw
         Br3ibyRa5EDx5zLhCes4JYuZLuVy2AsW8fRJW2lTzzzQxYmfd3QDygY98saVgx047dqU
         65v7fWjrQuFSBcXBWggu/cn8NT9R1lq7AIu8sAPs+uD4HRoAriDBeZmHTYLZ5Rs5Y1Qf
         4FkL++9HuVpH+reQHd27XexjsSovHSr9N+rYU2om7b5Cv82HGsQCBA6hMeb1xVWogAQ1
         l6FA==
In-Reply-To: <CAMeUXYuQobSo7Au07V2KBE6=mAqXW1Hj--G92FP0X1H97Kv8OA@mail.gmail.com>
Sender: cpufreq-owner@vger.kernel.org
List-ID: <cpufreq.vger.kernel.org>
Content-Type: text/plain; charset="us-ascii"; format="flowed"
To: Melanie Kambadur <melanie@cs.columbia.edu>, Viresh Kumar <viresh.kumar@linaro.org>, David C Niemi <dniemi@verisign.com>
Cc: "cpufreq@vger.kernel.org" <cpufreq@vger.kernel.org>, Linux PM list <linux-pm@vger.kernel.org>

On 10/24/2013 12:42 PM, Melanie Kambadur wrote:
>
>  From /sys/devices/system/cpu/cpuN/cpufreq/scaling_driver I get that
> the current p-state driver is called "intel_pstate". David, you
> mention that the firmware governors are not very efficient, do you
> suggest replacing the intel_pstate driver with a different driver?

I will need to look and see why changing to performance isn't working
correctly.

To get the behavior of the performance governor you can use

    echo 100 > /sys/devices/system/cpu/intel_pstate/min_perf_pct

This will force intel_pstate to select the highest P state and
leave it there.

Turbostat is useful for collecting frequency (P state) and idle (C state)
information.

--Dirk